Method of making valve stems



Fell). 17, 193i. J, WAHL 1,792,619

METHOD OF MAKING VALVE STEMS Filed Aug. 5, 192.7

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INVENTOR 1 @3 ,f M

By A torneys,

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'\ foot portions or bases of the stems, which en- Patented Feb. 17, 1931 UNITED stai-lss BATENT `orifice y JOHN WAHL, OF ROSEDLE, NEW' YORK, ASSIGNOB TO '.A.. SCI'ltfD-ERE SON, INCOR- PORATED, 0F BROOKLYN, NRW YORK, A CORPORATION OF NEW YOIEJK .METI-ID F IVIAKING VALVE STEMS applicati@ mea August Va,

This invention relates to the method of making tire valve stems, and more particularly to the method of forming the foot portion of such stems.

Heretofore tire valve stems have usually been formed from cylindrical solid blanks by subjecting one end thereof toV swaging or heading operations to provide them with enlarged flat heads which constituted y the.

larged portions were then finished `off and provided on the face adjacent the blank with one or more concentric groovesby a machining operation. This last-named operation, inl addition torequiring time andv producing scrap metal, also requires the foot to be of sufficient thickness to provide the neces-v sary strength for the valve stem at this point after the foot portion is grooved. A

According to the present invention I make the foot portion of the valve stem in such manner as to eliminate the finishing offend grooving machining operations thereon, by forming the groove or grooves in the base by a swaging operation. In this wayvI amenabled to make the foot portion thinner, without impairing its strength, and thereby realize a substantial saving in the manufacturing cost. y

According to my invention I make the valve stem from a blank by subjecting one end thereof to a plurality of swaging or heading operations to form an enlarged foot, and then subjecting said foot to a further swag-l a ing operation to displace the metal thereof to provide a plurality of concentric faces disposed in diferent planes. Preferably the last swaging operation is such as will simultaneously increase the kdiameter of the foot and provide it with an annular groove on its face adjacent the blank. The invention also embodies other features of novelty which will be hereinafter more fully'v described.

In the accompanying drawings, wherein I 1927, serial Np. `z ioss.

Vhave shown the various stages inthe formation of the valve stem,-

Figure-l shows ablank from which the stemis formed;

Figs. 2, 3 and 4 show the progressive stages of the heading operation performed on the blank of Fig. V 1, Ipart of Fig. 4 being'v shown in section; v

Fig. 5 is an elevation of a completed nvalve Stems F 1gs.j6 to 9 inclusive are end elevations' of VFigsl to respectively, viewed from the left of'rsaid figures; Y A

Figs. 10 'and 1l are end elevations of the opposite ends of the Vvalve stem shown in Fig. 5. f

In practicing the presentinventiona cylindrical solid blank, such as A, of definite length, which may be cut from rod stock, has one end thereof subjected to a swaging or heading operation in `a suitable machine. Preferably this heading loperation is performed upon the blank, without any preliminary heating, in what is known as a do-uble header machine, the first heading operation of which produces an enlargement such as shown at B in Fig. 2, and the second operation of which changes the form of the head B to that shown at C. The heat generated in the formation of the headl is availed of and facilitates the formation of the head C. after this operation the headed blank is annealed and the head C subjected toa further swaging operation which-produces the flattened head D. Theblank is then again annealed and subjected to a further swaging operation using appropriately-shaped dies which transform the head D into the head E. In the course of this last swaging operation the metal of the head D is displaced into different planes to pro-vide the concentric faces e and e', the latter being depressed, with respect to the former, so as to constitute in effect Van annular groove. This groove e', although hereinshown as being disposed ad- ]acent the toot of the unenlarged portion of the blank A, may, it desired, be spaced radially from said blank, or more than one such groove may be formed in said face.

The blank of Fig. 4 is now ready to be 'further acted upon to provide it With the eX- ternal threads F, the reduced threaded nipple G, the flats I-I, and the internal bore J, as shown in Figs. 5, l0 and 11, all of which may be done in the conventional manner. It Will thus be seen that the 'blank of Fig. 4, upon being subjected to the conventional iinishing operations to provide the parts F, G, H and J, will produce a valve stem which will not necessitate any machining operations for finishing otl' the foot portion and providing it with a tube-clamping groove.

It has been found in practicing the present invention that notwithstandingtheiact that the foot portion of the valve stemv is substantially thinner than lthe foot portion formed in accordance with the `methods'of formation heretofore practiced, it` `has substantially7 greater strength and requiresalesser amount of metal for its production. This sav-nig of metaland the sa'ving'of Athe'maehining operations upon the VJfoot portion result in-a substantial saving in the manufacturing cost, as will beapparent. A

IVhile I have sho-Wn and described the pre- 'fe `red methodof practicing my invention, I do not W'ish'towbe limited to the precise number of steps herein disclosed, or to the identical shapes of the heads formed? bythe varioussivaging operations, since various modilicatio-ns thereof` may be availed of Without departing from the spirit ot the invention;

il/'hat I claim is:

l. The method of making a blank tor a tire valve stem or the'like ffrom a 'cylindrical solid metal blank, Which comprises subjecting one end of the blank to swaging operations to provide it With an enlarged substantially Hat'foot and then clipping said foot to provide it with aiiannular Vgroove on its face adjacent the blank.

2. The method of making a blank for a tire valve stein or the likefrom a cylindrical solid metal blank, which-comprises subjecting one end of the blank to swaging operations to pr vide it With an'enlarged-substantially flat foot and `subjecting said foot toan additional swaging operation` to'increase its diameter and provide it with an annular groove on its face adjacent the blank.

3. The method of making a 1blank for a tire valve stem or the like from cylindrical solid metal blank, which comprises subjecting one end of the blankto swaging operations to provide it with an enlarged toot, the laces of which are substantially parallel, and then subjecting said vtoot to an additional swagiug operation to increase its diameter and displace 'the metal thereof to provide said foot Witha `bearing face and-anannular my name.

JOHN WAHL.

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